Analyze Your Current — Not Past — Customer Base You don’t use outdated response data to build your circulation plan. Rather, you use the most current response data available, right? So why do many catalogers depend on studies that are several years old to define their customers? A comprehensive analysis of your current customers’ job titles and SIC codes for the companies they represent can provide valuable insight. The more you know about your best customers, the more effective you’ll be at reaching others like them. For example, say you’ve been targeting 25 percent of your circulation to computer analysts; this is based